Quick disconnect coupling systems and related methods

A piston-side connector of a quick disconnect system, the piston-side connector comprising:

• a piston comprising a piston head, the piston head comprising a frustoconical and/or chamfered surface that defines a first cavity in the piston head, wherein the first cavity is to receive a poppet head of a poppet of a poppet-side connector of the quick disconnect system so that a step of a side surface of the poppet head seals an engagement between the poppet head and the frustoconical and/or chamfered surface of the piston head, and wherein, when the poppet head is within the first cavity, the first cavity is to isolate the poppet head, at least at its mating surface with the piston and at its longitudinal side surface, from a fluid when a fluid coupling is established between the piston-side connector and the poppet-side connector.

A poppet-side connector of a quick disconnect system, the poppet-side connector comprising:

• a poppet head of a poppet of the poppet-side connector, wherein the poppet head is adapted to fit within a cavity of a piston head of a piston-side connector of the quick disconnect system, wherein the piston head comprises a frustoconical and/or chamfered surface that defines the cavity in the piston head, wherein the poppet head comprises a step on a side surface of the poppet head, the step to seal an engagement between the poppet head and the frustoconical and/or chamfered surface of the piston head, and wherein the poppet head is adapted to be isolated, at least at its mating surface with the piston and at its longitudinal side surface, from fluid through the quick disconnect system after a fluid coupling is established between the piston-side connector and the poppet-side connector.